Grooving machine



Aug. 1, 1939.

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* R. F. ONSRUD 2,168,234

cnoovme MACHINE Filed July '7, 1956 3 Sheets-Sheet l /I/I/II /////I J11 fen for .RudoQu/zJfOrz-srud Aiiys.

Aug. 1, 1939. R. F. ONSRUD GROOVING MACHINE Filed July 7, 1936 3 Sheets-Sheet 2 rd H mm A s um h Aug. 1, 1939. R. F. ONSRUD GROOVING MACHINE Filed July '7, 1956 3 Sheets-Sheet 5 .272 yen tor" a o/zFfOrzsrud Patented Aug. 1, 1939 UNITED STATES GRO OVING MACHINE Rudolph F. Onsrud, Chicago, Ill., assignor to Onsrud Machine Works, Inc., Chicago, Ill., a

corporation of Illinois Application July 7, 1936, Serial No. 89,320

Claims.

This invention relates to machines for scarfing or cutting grooves such as in' boards where the walls of the grooves may have any desired contour, one wall being different from the other;

for example, as required when a board is bent to form a round corner in which case the side walls of the groove come together with projections on one wall interfitting with recesses on the other wall.

An example of a product for which this machine is adapted is the wood corner construction described in the patent to Rudolph F. Onsrud No, 2,026,650 issued January 7, 1936. In forming that construction, boards, faced with veneer,

are grooved, on the opposite side to the veneer facing, in a straight line where it is desired to bend the board in order to form an outer rounded corner with the veneer continuous around the corner.

The improved machine herein disclosed is useful for the purpose above-mentioned and for various other grooving or molding and shaping operations, being capable of working upon the edge of stock or grooving one face of it.v

The purposes of the invention are to provide an improved machine for doing the work abovementioned at high speed and which is adapted for operating a plurality of cutters of different forms and providing for vertical and lateral adjustment of the cutters, wherein some may be working upon both sides and others on one side only in the making of grooves.

Further purposes of the invention are to provide improvements in drive arrangements for multiple cutters, in which a driving means and cutter spindles are mounted to form a single traveling unit for cooperating with relatively stationary work-supporting means, and to provide improved clamping means capable of taking boards of various dimensions and allowing their insertion and removal from the machine with rapidity and ease and laterally with reference to the path of travel of the cutting unit. V

The purposes of the invention are accomplished 454 by means of a construction as illustrated in the accompanying drawings, wherein:

Figure 1 is a perspective view of the machine taken from the right front corner thereof.

Fig. 2 is a perspective rear view of the machine.

50 Fig. 3 is a detail partly in transverse vertical section through air cylinders and shows clamp operating pistons therein.

Fig. 4 is a fragmentary detail in horizontal section showing the mounting of the traveling 5; cutting unit and the individual adjustable spindle supports thereof and a feed screw for causing a traveling movement of the cutting unit as a whole.

Fig. 5 is a fragmentary sectional view of a grooved board to illustrate a sample of work performed by the machine.

With reference to its general arrangement this machine has a work supporting table over which extends a support on which there is a traveling multiple spindle cutting unit and the support is arched over the table to enable the sidewise insertion and removal of the boards which are operated upon.

Also extending over the machine bed are a pair of spaced clamp-operating shafts, one on 15 each side of. the line of travel of the cutters. These shafts are operated by pneumatic pistons having crank connection with the ends of the shafts and fitting within cylindersmounted at the end of the machine base. 0 A convenient manually operated air valve is at'the front side of the machine for operating the clamps and near it are switch buttons whereby the circuit for the motor for driving the cutter spindles may be closed and opened. Also a control is provided for the motor which operates the; feed screw for the cutting unit. At the rear of the machine, there is an operating means for a relay connected with a magnetic switch for stopping the feed screw drive in its forward and reverse operations and includes connections for reversing the motor.

As shown in the drawings, a machine bed I is supported on end pedestals 2 and 3. The worksupporting table top on bed I is indicated at 4, 35 an upper supporting structure at 5 for the cutting unit and a feed screw for the latter. Structure 5 is shown arched at 6 over the table top to leave clearance for the insertion and removal of the boards operated upon from the front or rear 40 of the machine.

Boards operated upon are shoved against transverse cleats l and may be otherwise trued up with reference to the path of travel of the cutters by means of gauge elements 8, at the rear of the machine, slidably mounted on a fixed rail 9, and carrying adjustable gauge elements it).

The work is clamped on the table top 4 prior to the engagement therewith of the cutters by means of rocker arms ll, carried by shafts I2, -9 Fig. 3, and which in turn are oscillated by crank connection I3 with pistons l4 operating in the stationary cylinders I5.

Air is admitted and released to and from opposite ends of the cylinders by means of a handcontrolled air valve l6 (Fig.

When the pistons are operated in such direction as to rock the arms I l downwardly (Fig. 3), springs H are compressed against the clampoperating arms l8 which in turn bear downwardly upon the board-clamping elements l9. These clamping elements are normally held up to give clearance for boards placed therebeneath by springs 20 at their ends and the clamps are vertically guided by pintles 2| fitting bearings in the frame structure 5.

The cutting unit rests upon a rail 22 formed at the upper end of the frame structure 5, and is also guided by a lower rail 23 on the face of the supporting structure 5. The frame 24 of the cutting unit carries a nut 25 which fits the screw shaft 25 by means of which the cutting unit is driven forwardly and reversely along the work supporting table 4. The frame structure 24 of the cutting unit has vertical guideways 21 (Fig. l) and 28 (Fig. 4) for receiving the dovetailed blocks 29 and 30 respectively for supporting the motor 3i and the cutting heads 32 to 35 inclu-' sive. The cutting heads are laterally adjustable in brackets numbers 30 to 39 inclusive, which are adjustable lengthwise of the machine along the horizontal dovetail flanges 48 projecting from the dovetailed blocks 30. Adjustment of the cutter head supporting elements along the dovetails 40 is effected by means of screws. Thescrew 4| is carried by a bracket 42 fixed on the cutting unit frame 24 and this screw acts against the support 36 for the cutting head 32 for adjustment of its belt 43. The screw 44 acts between the supports 36 and 37 for the purpose of tightening the second belt and the screws 45 and 46 are used forv tightening the third and fourth belts. All of the belts are driven by a single pulley 41 keyed to the motor shaft 48.

Vertical adjustment of the motor and its pulley is effected by means of screw 49 having a bearing in an arm 49 carried by the motor frame support 29 and acting on the cutter unit frame 24. Vertical adjustment of the individual cutting heads is effected by means of screws 58 which have bearings in the arms 5| on frame 24, and are threaded into the slide members 30.

The motor for operating screw 26 indicated at 52, (Fig. 2) is mounted on the back of the machine frame, and has a belt connection within the guard 53 to the shaft 26. Both motors are controlled by manually operated switch buttons at the front of switch box 54. The buttons 55 and 55 control the starting and stopping of motor 3| and the button 51 is for starting the motor 52 and both motors may be stopped by switch throwing lever 58. The direction of rotation of motor 52 is dependent upon the setting of a brush shift ing means 58, Fig. '2.

The motor 52 is automatically stopped and the brushes are shifted for reverse action of the motor, when the button 51 is again depressed, by means of the reciprocating rod 59 (Fig. 2) whenever the cutting unit reaches the ends of its backand-forth traveling along the machine frame. For this purpose the cutting unit frame 24 carries a fixed arm 60 which is slidable along the rod 59 so as to engage stops BI and 62 thereon. The rod carries an arm 63 having a pivot connection 54 with bell crank lever 65, which has a bearing in bracket and operates the brush shifter 58. Bell crank lever 65 also operates a switch 62 having a conduit connection 68 with a magnetic relay in box 54 which serves to open the switch for motor 52. Thus the motor is stopped at the end of the strokes of the cutting unit and does not again operate until the operator presses button 5'! but the direction of rotation of the motor is controlled by brush shifter 58.

The cutting heads 32, 33 and 34 are capable of being shifted laterally with respect to the direction of motion of the cutting unit in order that cutters carried by these heads may operate on one side or the other only of the groove being out. In making grooves of complicated outline wherein one wall of the groove may be of a different contour than the other wall, it is necessary to provide different cutters for the opposite sides of the groove. Thus this adjustment is provided for and is accomplished by means of screws 69 which engage and move the cutting heads in the supports 36, 31 and 38.

In using the machine the stock operated upon may be slid in place from the front of the machine, the left side thereof, Fig. 1, over the table top I and underneath the clamp shafts I2 and the clamps 19, the gauges having been adjusted for the particular size of stock to be operated upon. The cutting elements are adjusted to the proper level by means of the screws 50 and the motor 3| is also adjusted to a corresponding position by the screw 49. Some of the cutters are also adjusted laterally by means of screws 69 according to what form of groove is wanted. The operation of the machine in forming the cut is simple and the only manipulations required of the operator are first to adjust valve l6 so that air is admitted to the lower ends of cylinders i5. This causes the required partial rotation of shafts I2 for operation of the clamps which then firmly but resiliently hold the board in place.

Then the switch button 55 for motor 3| is depressed, and all of thecutters are rotated atapproximately the same speeds, 25,000 to 30,000 R. P. M. Next the switch button 56 for motor 52 is depressed and screw 20 rotates in a direction to advance'the cutting unit along the board toward the far end of the machine, Fig. 1.

When it has completed the cut, which may be, for example, a groove such as illustrated in Fig. 5, the arm 60, Fig. 2, engages collar 62 on rod 59, shifting this rod to the right against spring resistance and thus operating bell crank lever 65. This results in an operation of switch lever 61 closing the circuit ofa magnetic relay in switch box 54, Fig. 1, which relay serves to open the circuit of motor 52.

The same motion of bell crank lever 65 operates the brush adjuster '58, seating the brushes in position for reverse operation of the motor when its circuit is again closed by depression of button 56, by the operator in order to; have the cutting unit again restored to the starting position. When it arrives at the starting position as shown in Fig. lithe arm 50, Fig. 2, engages stop 62' and causes the rod 59 to move to the left, and to swing the bell crank lever 65 back to its original position when it again momentarily closes the relay circuit by operation of switch 61 and at the same time restores the brush shifter 58 to its original position.

I claim:

1. A machine of the class described for making undercut grooves of varying configurations, consisting of a frame structure including a worksupport and means for clamping material to be operated upon stationary on said support, a cutting unit comprising a series of tool-carrying spindles perpendicular to said support, means for causing said cutting unit to travel along said support in a direction parallel to a plane perpendicular to said support and extending through the several spindles, means for effecting relative adjustment between said spindles laterally of said plane, and said cutting unit including driving means operative for rotating each of said spindles in varying positions of lateral adjustment thereof.

2. A machine for forming undercut grooves of varying configurations, consisting of a frame structure having mounted thereon a work support, work clamping means, a cutting unit, said cutting unit comprising a series of tool-carrying spindles arranged substantially in line for the purpose of causing tools carried thereby to successively perform cutting operations in forming a single groove in stock carried by said work support, means for adjusting said spindles relatively to each other in the direction of the axes of said spindles, means for adjusting said spindles laterally to their axial adjustment, a common drive for said spindles, and means for causing a relative feed movement between the cutting unit and the work support.

3. A machine for forming undercut grooves of varying configurations, consisting of a frame structure having mounted thereon a work support, work clamping means, a cutting unit, said cutting unit comprising a series of tool-carrying spindles arranged substantially in line for the purpose of causing tools carried thereby to successively perform cutting operations in forming a single groove in stock carried by said work support, means for adjusting said spindles relatively to each other in the direction of the axes of said spindles, means for adjusting said spindles at right-angles to their axial adjustment, a common drive for said spindles, said common drive consisting of a rotating drive pulley carrying a series of overlying belts, one to, each cutting spindle, and means for causing a relative feed movement between the cutting unit and the work support.

4. A machine for forming undercut grooves of varying configurations, consisting of a frame structure including a work support and means for clamping material to be operated upon stationary on said support, a cutting unit comprising a series of tool-carrying spindles perpendicular to said support, means for causing a relative feed movement between said cutting unit and said support in a direction parallel to a plane perpendicular to said support and extending through the several spindles, means for efiecting relative adjustment between said spindles laterally of said plane, means for eiTecting relative adjustment between said spindles in the direction of their axes, and said cutting unit including driving means operative for rotating each of said spindles in different adjusted positions thereof.

5. A machine for forming undercut grooves of varying configurations, consisting of a frame structure having mounted thereon a work support, a cutting unit, said cutting unit comprising a series of tool carrying spindles arranged substantially in line for the purpose of causing tools carried thereby to successively perform cutting operations in forming a single groove in stock carried by said Work support, means for adjusting said spindles relatively to each other in the direction of the axes of said spindles, means for adjusting said spindles laterally totheir axial adjustment, a driving means for said spindles, and means for causing a relative feed movement between the cutting unit and the work support.

RUDOLPH F. QNSRUD. 

